Error: Access violation at 02271d4a in module observerdll.dll read address

Question

I am using Delphi 5, SAP DI API for SAP 2004.
On a users machine, when we try to connect, we get an error "Access violation at 02271d4a in module observerdll.dll read address 00000000".
Anyone know why they could be getting this error?  And what I need to do to fix it?
thanks
Bill

Answer 1

The problem is I have not been able to reproduce the problem on any of the machines in my office, this is only happening on a client machine.  They have just the SAP client, and our program that uses the DI API.
I have instructed my client to search for that dll, and try to rename it, and rerun it.  Not sure whether this will fix it or not.
Here is some example code I am using, I do not at this time know the exact point where the error is returning from, I assume from the Connect function.
function TtcSAP.Connect: string;
begin
  // return empty on success
  Result := '';
  try
    // make sure it was created
    if not Assigned(oCompany) then
    begin
      Result := 'Error creating Company object.';
      Exit;
    end;
    if oCompany.Connected then
      oCompany.Disconnect;
    // Specify the user name and password
    oCompany.UserName := sUserName;
    oCompany.Password := sPassword;
    oCompany.DbUserName := sDbUserName;
    oCompany.DbPassword := sDbPassword;
    oCompany.UseTrusted := bUseTrusted;
    // misc settins
    oCompany.language := ln_English;
    // Specify the Company database
    oCompany.CompanyDB := sCompanyDB;
    // specify the server
    oCompany.Server := sServer;
    // connect (0 = success)
    if oCompany.Connect() <> 0 then
    begin
      Result := GetLastError;
      if Trim(Result) = '' then
        Result := 'Connection failed.';
    end;
  except
    on E: Exception do
      Result := E.Message;
  end;
end;